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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 22 — Oct. 25, 2010
  • pp: 22762–22771

Broadband time-domain absorption spectroscopy with a ns-pulse supercontinuum source

Yaroslav Sych, Rainer Engelbrecht, Bernhard Schmauss, Dimitrii Kozlov, Thomas Seeger, and Alfred Leipertz  »View Author Affiliations

Optics Express, Vol. 18, Issue 22, pp. 22762-22771 (2010)

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A Q-switched laser based system for broadband absorption spectroscopy in the range of 1390-1740 nm (7200-5750 cm−1) has been developed and tested. In the spectrometer the 1064 nm light of a 25 kHz repetition-rate micro-chip Nd:YAG laser is directed into a photonic crystal fiber to produce a short (about 2 ns) pulse of radiation in a wide spectral range. This radiation is passed through a 25 km long dispersive single-mode fiber in order to spread the respective wavelengths over a time interval of about 140 ns at the fiber output. This fast swept-wavelength light source allows to record gas absorption spectra by temporally-resolved detection of the transmitted light power. The realized spectral resolution is about 2 cm−1. Examples of spectra recorded in a cell with CO2:CH4:N2 gas mixtures are presented. An algorithm employed for the evaluation of molar concentrations of different species from the spectra with non-overlapping absorption bands of mixture components is described. The uncertainties of the concentration values retrieved at different acquisition times due to the required averaging are evaluated. As an example, spectra with a signal-to-noise ratio large enough to provide species concentrations with a relative error of 5% can be obtained in real time at a millisecond time scale. Potentials and limitations of this technique are discussed.

© 2010 OSA

OCIS Codes
(190.4360) Nonlinear optics : Nonlinear optics, devices
(300.1030) Spectroscopy : Absorption
(300.6360) Spectroscopy : Spectroscopy, laser

ToC Category:

Original Manuscript: July 19, 2010
Revised Manuscript: October 1, 2010
Manuscript Accepted: October 6, 2010
Published: October 13, 2010

Yaroslav Sych, Rainer Engelbrecht, Bernhard Schmauss, Dimitrii Kozlov, Thomas Seeger, and Alfred Leipertz, "Broadband time-domain absorption spectroscopy with a ns-pulse supercontinuum source," Opt. Express 18, 22762-22771 (2010)

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